Headspace solid-phase microextraction - a tool for new insights into the long-term thermo-oxidation mechanism of polyamide 6.6
2001 (English)In: Journal of Chromatography A, ISSN 0021-9673, E-ISSN 1873-3778, Vol. 932, no 02-jan, 1-11 p.Article in journal (Refereed) Published
Low-molecular-mass products formed. during thermo-oxidation of polyamide 6.6 at 100 degreesC were extracted by headspace solid-phase microextraction and identified by GC-MS. A total of 18 degradation products of polyamide 6.6 were identified. In addition some low-molecular-mass products originating from the lubricants were detected. The identified degradation products were categorized into four groups where compounds within each group contain the same structural feature. In groups A, B and C several new thermo-oxidation products of polyamide 6.6 were identified including cyclic imides, pyridines and structural fragments from the original polyamide chain. 1-Pentyl-2,5-pyrrolidinedione (pentylsuccinimide) showed the largest increase in abundance during oxidation. The cyclopentanones in group D were already present in the un-aged material. Their amounts decreased during ageing and they are thus not formed during thermo-oxidation of polyamide 6.6 at 100 degreesC. The identified thermo-oxidation products can be formed as a result of extensive oxidation of the hexamethylenediamine unit in the polyamide backbone. The degradation products pattern shows that the long-term thermo-oxidative degradation, just like thermal degradation and photo-oxidation of polyamide 6.6, starts at the N-vicinal methylene groups.
Place, publisher, year, edition, pages
2001. Vol. 932, no 02-jan, 1-11 p.
headspace solid-phase microextraction, thermo-oxidation, polyamide 6.6, environmentally degradable polyethylene, chromatography mass-spectrometry, gas-chromatography, thermooxidative degradation, photooxidative degradation, active chromophores, products, pyrolysis, polymers, susceptibility
Polymer Technologies Polymer Chemistry
IdentifiersURN: urn:nbn:se:kth:diva-21018DOI: 10.1016/S0021-9673(01)01230-4ISI: 000171575200001OAI: oai:DiVA.org:kth-21018DiVA: diva2:339715
QC 20100525 NR 201408042010-08-102010-08-102012-02-01Bibliographically approved